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Task: Explain the historical background of the following event
Input: The birth of the United Nations
Output:
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The United Nations was created following the destruction and devastation of World War II to prevent further conflicts. Its human rights charter was signed on June 26, 1945 in San Francisco, California. It replaced the ineffective League of Nations, which had failed to prevent World War II, and officially came into being on October 24, 1945 after ratification by majority of the 51 founding members.